Cross-country ski boot



FIG. 1 is a right side elevational view of a cross-country ski boot showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a cross-country ski boot, as shown and described. 